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Speedometer/Odometer stopped working 900 1997

posted by  Metallo on  Sun Jul 14 19:25 CST 2024
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last visit: Wed Feb 29 21:03 CST 2012
[RELATED]

Hi folks,

My speedometer and odometer stopped working today.

I had this issue years ago, and I remember I reflowed all the soldering on the PCB foil, which fixed the problem.

Today, before doing anything, I removed the speedometer, and much to my pleasant surprise, it looks new. Also, the PCB is not the same as the one you see in any documentation in NA; it is for EU and from 1996, so I'd say it looks simpler.

See some images below:

https://postimg.cc/3dT3N6Wq

https://postimg.cc/rKNMrJrw

https://postimg.cc/xXjYyzvy

https://postimg.cc/sMnzngKF

Now, I know the issue is coming from the instrument panel because tapping on it makes the whole thing start working again, and I'm certain it's due to a bad solder on the PCB foil.

The only area where I see the soldering is brownish is in this photo I took when I removed the speedometer:

https://postimg.cc/B8X0Rfwj

I couldn't find any weak solder joints all over the foil, but I would like to reflow only the ones related to the speedometer/odometer.

I can't find the schematic of the instrument panel; I mean, I can find one, but it's only related to the wiring, not the actual PCB.

Do you happen to know if those resistors are somehow related to the speedometer/odometer?

If that's the case, I will just reflow them.
If not, are there any other solder joints you would recommend reflowing?

I've attached this image I took in 2015, the first time I reflowed all of them.

https://postimg.cc/QFRDLyLS

NOTE: Weird that the Volvo # on the speedometer does not exist anywhere, I got a different one, although very similar, on VIDA for my car.

Thank you!
Alex






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